Year Percent 1992-01-01 951.6961948708010000 1993-01-01 108.9895406243230000 1994-01-01 35.9247053929643000 1995-01-01 24.9759355316750000 1996-01-01 17.6104698431032000 1997-01-01 8.4473834209295500 1998-01-01 4.6442142266078200 1999-01-01 2.3648183611180600 2000-01-01 2.6542547779605200 2001-01-01 2.4870400355545500 2002-01-01 1.9388757385589200 2003-01-01 2.9426475294848100 2004-01-01 6.1923854719743300 2005-01-01 6.7484502789311700 2006-01-01 6.5361990876587500 2007-01-01 10.0929775849168000 2008-01-01 15.4023191064986000 2009-01-01 3.5341067285894100 2010-01-01 -1.0846359501515900 2011-01-01 4.3707355993922100 2012-01-01 2.2577892437459400 2013-01-01 -0.0294547782578977 2014-01-01 0.6204906367323770 2015-01-01 0.1742422436252140 2016-01-01 0.1406333345052920 2017-01-01 2.9303631237466400